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![Linus Torvalds](/assets/img/avatar_default.png)
JFFS2: - Fix memory corruption in error path - Spelling and coding style fixes UBI: - Switch to BLK_MQ_F_BLOCKING in ubiblock - Wire up partent device (for sysfs) - Multiple UAF bugfixes - Fix for an infinite loop in WL error path UBIFS: - Fix for multiple memory leaks in error paths - Fixes for wrong space accounting - Minor cleanups - Spelling and coding style fixes -----BEGIN PGP SIGNATURE----- iQJKBAABCAA0FiEEdgfidid8lnn52cLTZvlZhesYu8EFAmP/BSMWHHJpY2hhcmRA c2lnbWEtc3Rhci5hdAAKCRBm+VmF6xi7wX5QEADnPsAW87AIi44UlkbAsJEjkEqU yQrI9UPsdqfE7K5OR7Vb2tOti3MLfaiJ5MTG64xNaTEgmrbcqo4GgENk4Pe6zJ9q azO/xWTr6r8G4aE70KhsUBc9Vc/99Ok48rxLHJS+u7s+FvOJ//WirGXjyNZEVDyx TgvH80rhUlfj1ExqEXLcUfQ53WUnR3PefOw+zIi29ldtgaI/TFmnWObl2A/XtsGr 0ExIdqDnoTfSsYecfGP71jVbYH8u2mLFe2zNOYW1pvrHYhcet6Q6e+69fgnyNRf9 5s5dbDPmmWN2Qdz63AWwHfC4mncoQdc7HbnnKIk6bTm3v6gqXQSrgy/hZEX3LmWr G41j7RLhBMZ2mljRfFQH97V71n9TL010T6jZ5zurvqErXtVdFImmInGmqY3AR13I fzUWnJf81xKgcMv6My2/nEVGDtrGLFdILoT8j6VIXQO6teqtF7Vip7UfamrwL399 57fy0Iwbx2aume/IdwI3TZYacBQ2d8GvQxTZshJ+qx+gCvhb6EyiSIn3AOgtrbAo srXMy+6xXJecKNHR7Bl1C5BLei/25HDIYjk/yiAH/IhhV20c5eiySSvA+q720Gcz reBLFh7EtcP51B2GXMdSCOgYY8wGaMl5zlbiLYzY79ptgnnBJ7luuYjc3c02MGB9 25qVLnpvC/ZREzZqLg== =fTYq -----END PGP SIGNATURE----- Merge tag 'ubifs-for-linus-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs Pull jffs2, ubi and ubifs updates from Richard Weinberger: "JFFS2: - Fix memory corruption in error path - Spelling and coding style fixes UBI: - Switch to BLK_MQ_F_BLOCKING in ubiblock - Wire up partent device (for sysfs) - Multiple UAF bugfixes - Fix for an infinite loop in WL error path UBIFS: - Fix for multiple memory leaks in error paths - Fixes for wrong space accounting - Minor cleanups - Spelling and coding style fixes" * tag 'ubifs-for-linus-6.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/ubifs: (36 commits) ubi: block: Fix a possible use-after-free bug in ubiblock_create() ubifs: make kobj_type structures constant mtd: ubi: block: wire-up device parent mtd: ubi: wire-up parent MTD device ubi: use correct names in function kernel-doc comments ubi: block: set BLK_MQ_F_BLOCKING jffs2: Fix list_del corruption if compressors initialized failed jffs2: Use function instead of macro when initialize compressors jffs2: fix spelling mistake "neccecary"->"necessary" ubifs: Fix kernel-doc ubifs: Fix some kernel-doc comments UBI: Fastmap: Fix kernel-doc ubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() ubi: fastmap: Fix missed fm_anchor PEB in wear-leveling after disabling fastmap ubifs: ubifs_releasepage: Remove ubifs_assert(0) to valid this process ubifs: ubifs_writepage: Mark page dirty after writing inode failed ubifs: dirty_cow_znode: Fix memleak in error handling path ubifs: Re-statistic cleaned znode count if commit failed ubi: Fix permission display of the debugfs files ...
1733 lines
44 KiB
C
1733 lines
44 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* * This file is part of UBIFS.
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*
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* Copyright (C) 2006-2008 Nokia Corporation.
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* Copyright (C) 2006, 2007 University of Szeged, Hungary
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*
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* Authors: Artem Bityutskiy (Битюцкий Артём)
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* Adrian Hunter
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* Zoltan Sogor
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*/
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/*
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* This file implements directory operations.
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*
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* All FS operations in this file allocate budget before writing anything to the
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* media. If they fail to allocate it, the error is returned. The only
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* exceptions are 'ubifs_unlink()' and 'ubifs_rmdir()' which keep working even
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* if they unable to allocate the budget, because deletion %-ENOSPC failure is
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* not what users are usually ready to get. UBIFS budgeting subsystem has some
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* space reserved for these purposes.
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*
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* All operations in this file write all inodes which they change straight
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* away, instead of marking them dirty. For example, 'ubifs_link()' changes
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* @i_size of the parent inode and writes the parent inode together with the
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* target inode. This was done to simplify file-system recovery which would
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* otherwise be very difficult to do. The only exception is rename which marks
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* the re-named inode dirty (because its @i_ctime is updated) but does not
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* write it, but just marks it as dirty.
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*/
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#include "ubifs.h"
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/**
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* inherit_flags - inherit flags of the parent inode.
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* @dir: parent inode
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* @mode: new inode mode flags
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*
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* This is a helper function for 'ubifs_new_inode()' which inherits flag of the
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* parent directory inode @dir. UBIFS inodes inherit the following flags:
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* o %UBIFS_COMPR_FL, which is useful to switch compression on/of on
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* sub-directory basis;
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* o %UBIFS_SYNC_FL - useful for the same reasons;
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* o %UBIFS_DIRSYNC_FL - similar, but relevant only to directories.
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*
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* This function returns the inherited flags.
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*/
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static int inherit_flags(const struct inode *dir, umode_t mode)
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{
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int flags;
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const struct ubifs_inode *ui = ubifs_inode(dir);
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if (!S_ISDIR(dir->i_mode))
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/*
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* The parent is not a directory, which means that an extended
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* attribute inode is being created. No flags.
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*/
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return 0;
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flags = ui->flags & (UBIFS_COMPR_FL | UBIFS_SYNC_FL | UBIFS_DIRSYNC_FL);
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if (!S_ISDIR(mode))
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/* The "DIRSYNC" flag only applies to directories */
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flags &= ~UBIFS_DIRSYNC_FL;
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return flags;
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}
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/**
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* ubifs_new_inode - allocate new UBIFS inode object.
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* @c: UBIFS file-system description object
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* @dir: parent directory inode
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* @mode: inode mode flags
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* @is_xattr: whether the inode is xattr inode
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*
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* This function finds an unused inode number, allocates new inode and
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* initializes it. Returns new inode in case of success and an error code in
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* case of failure.
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*/
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struct inode *ubifs_new_inode(struct ubifs_info *c, struct inode *dir,
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umode_t mode, bool is_xattr)
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{
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int err;
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struct inode *inode;
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struct ubifs_inode *ui;
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bool encrypted = false;
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inode = new_inode(c->vfs_sb);
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ui = ubifs_inode(inode);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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/*
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* Set 'S_NOCMTIME' to prevent VFS form updating [mc]time of inodes and
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* marking them dirty in file write path (see 'file_update_time()').
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* UBIFS has to fully control "clean <-> dirty" transitions of inodes
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* to make budgeting work.
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*/
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inode->i_flags |= S_NOCMTIME;
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inode_init_owner(&nop_mnt_idmap, inode, dir, mode);
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inode->i_mtime = inode->i_atime = inode->i_ctime =
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current_time(inode);
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inode->i_mapping->nrpages = 0;
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if (!is_xattr) {
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err = fscrypt_prepare_new_inode(dir, inode, &encrypted);
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if (err) {
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ubifs_err(c, "fscrypt_prepare_new_inode failed: %i", err);
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goto out_iput;
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}
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}
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switch (mode & S_IFMT) {
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case S_IFREG:
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inode->i_mapping->a_ops = &ubifs_file_address_operations;
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inode->i_op = &ubifs_file_inode_operations;
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inode->i_fop = &ubifs_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &ubifs_dir_inode_operations;
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inode->i_fop = &ubifs_dir_operations;
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inode->i_size = ui->ui_size = UBIFS_INO_NODE_SZ;
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break;
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case S_IFLNK:
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inode->i_op = &ubifs_symlink_inode_operations;
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break;
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case S_IFSOCK:
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case S_IFIFO:
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case S_IFBLK:
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case S_IFCHR:
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inode->i_op = &ubifs_file_inode_operations;
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break;
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default:
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BUG();
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}
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ui->flags = inherit_flags(dir, mode);
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ubifs_set_inode_flags(inode);
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if (S_ISREG(mode))
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ui->compr_type = c->default_compr;
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else
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ui->compr_type = UBIFS_COMPR_NONE;
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ui->synced_i_size = 0;
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spin_lock(&c->cnt_lock);
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/* Inode number overflow is currently not supported */
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if (c->highest_inum >= INUM_WARN_WATERMARK) {
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if (c->highest_inum >= INUM_WATERMARK) {
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spin_unlock(&c->cnt_lock);
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ubifs_err(c, "out of inode numbers");
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err = -EINVAL;
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goto out_iput;
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}
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ubifs_warn(c, "running out of inode numbers (current %lu, max %u)",
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(unsigned long)c->highest_inum, INUM_WATERMARK);
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}
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inode->i_ino = ++c->highest_inum;
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/*
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* The creation sequence number remains with this inode for its
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* lifetime. All nodes for this inode have a greater sequence number,
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* and so it is possible to distinguish obsolete nodes belonging to a
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* previous incarnation of the same inode number - for example, for the
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* purpose of rebuilding the index.
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*/
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ui->creat_sqnum = ++c->max_sqnum;
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spin_unlock(&c->cnt_lock);
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if (encrypted) {
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err = fscrypt_set_context(inode, NULL);
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if (err) {
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ubifs_err(c, "fscrypt_set_context failed: %i", err);
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goto out_iput;
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}
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}
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return inode;
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out_iput:
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make_bad_inode(inode);
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iput(inode);
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return ERR_PTR(err);
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}
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static int dbg_check_name(const struct ubifs_info *c,
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const struct ubifs_dent_node *dent,
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const struct fscrypt_name *nm)
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{
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if (!dbg_is_chk_gen(c))
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return 0;
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if (le16_to_cpu(dent->nlen) != fname_len(nm))
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return -EINVAL;
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if (memcmp(dent->name, fname_name(nm), fname_len(nm)))
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return -EINVAL;
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return 0;
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}
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static struct dentry *ubifs_lookup(struct inode *dir, struct dentry *dentry,
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unsigned int flags)
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{
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int err;
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union ubifs_key key;
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struct inode *inode = NULL;
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struct ubifs_dent_node *dent = NULL;
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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struct fscrypt_name nm;
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dbg_gen("'%pd' in dir ino %lu", dentry, dir->i_ino);
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err = fscrypt_prepare_lookup(dir, dentry, &nm);
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generic_set_encrypted_ci_d_ops(dentry);
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if (err == -ENOENT)
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return d_splice_alias(NULL, dentry);
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if (err)
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return ERR_PTR(err);
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if (fname_len(&nm) > UBIFS_MAX_NLEN) {
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inode = ERR_PTR(-ENAMETOOLONG);
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goto done;
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}
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dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
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if (!dent) {
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inode = ERR_PTR(-ENOMEM);
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goto done;
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}
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if (fname_name(&nm) == NULL) {
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if (nm.hash & ~UBIFS_S_KEY_HASH_MASK)
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goto done; /* ENOENT */
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dent_key_init_hash(c, &key, dir->i_ino, nm.hash);
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err = ubifs_tnc_lookup_dh(c, &key, dent, nm.minor_hash);
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} else {
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dent_key_init(c, &key, dir->i_ino, &nm);
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err = ubifs_tnc_lookup_nm(c, &key, dent, &nm);
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}
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if (err) {
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if (err == -ENOENT)
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dbg_gen("not found");
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else
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inode = ERR_PTR(err);
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goto done;
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}
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if (dbg_check_name(c, dent, &nm)) {
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inode = ERR_PTR(-EINVAL);
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goto done;
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}
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inode = ubifs_iget(dir->i_sb, le64_to_cpu(dent->inum));
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if (IS_ERR(inode)) {
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/*
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* This should not happen. Probably the file-system needs
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* checking.
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*/
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err = PTR_ERR(inode);
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ubifs_err(c, "dead directory entry '%pd', error %d",
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dentry, err);
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ubifs_ro_mode(c, err);
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goto done;
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}
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if (IS_ENCRYPTED(dir) &&
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(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
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!fscrypt_has_permitted_context(dir, inode)) {
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ubifs_warn(c, "Inconsistent encryption contexts: %lu/%lu",
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dir->i_ino, inode->i_ino);
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iput(inode);
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inode = ERR_PTR(-EPERM);
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}
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done:
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kfree(dent);
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fscrypt_free_filename(&nm);
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return d_splice_alias(inode, dentry);
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}
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static int ubifs_prepare_create(struct inode *dir, struct dentry *dentry,
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struct fscrypt_name *nm)
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{
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if (fscrypt_is_nokey_name(dentry))
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return -ENOKEY;
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return fscrypt_setup_filename(dir, &dentry->d_name, 0, nm);
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}
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static int ubifs_create(struct mnt_idmap *idmap, struct inode *dir,
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struct dentry *dentry, umode_t mode, bool excl)
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{
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struct inode *inode;
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
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.dirtied_ino = 1 };
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struct ubifs_inode *dir_ui = ubifs_inode(dir);
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struct fscrypt_name nm;
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int err, sz_change;
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/*
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* Budget request settings: new inode, new direntry, changing the
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* parent directory inode.
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*/
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dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
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dentry, mode, dir->i_ino);
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err = ubifs_budget_space(c, &req);
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if (err)
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return err;
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err = ubifs_prepare_create(dir, dentry, &nm);
|
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if (err)
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goto out_budg;
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sz_change = CALC_DENT_SIZE(fname_len(&nm));
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inode = ubifs_new_inode(c, dir, mode, false);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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goto out_fname;
|
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}
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err = ubifs_init_security(dir, inode, &dentry->d_name);
|
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if (err)
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goto out_inode;
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|
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mutex_lock(&dir_ui->ui_mutex);
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dir->i_size += sz_change;
|
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dir_ui->ui_size = dir->i_size;
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dir->i_mtime = dir->i_ctime = inode->i_ctime;
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err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
|
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if (err)
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goto out_cancel;
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mutex_unlock(&dir_ui->ui_mutex);
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|
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ubifs_release_budget(c, &req);
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fscrypt_free_filename(&nm);
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insert_inode_hash(inode);
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d_instantiate(dentry, inode);
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return 0;
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|
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out_cancel:
|
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dir->i_size -= sz_change;
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dir_ui->ui_size = dir->i_size;
|
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mutex_unlock(&dir_ui->ui_mutex);
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out_inode:
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make_bad_inode(inode);
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iput(inode);
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out_fname:
|
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fscrypt_free_filename(&nm);
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out_budg:
|
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ubifs_release_budget(c, &req);
|
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ubifs_err(c, "cannot create regular file, error %d", err);
|
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return err;
|
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}
|
|
|
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static struct inode *create_whiteout(struct inode *dir, struct dentry *dentry)
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{
|
|
int err;
|
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umode_t mode = S_IFCHR | WHITEOUT_MODE;
|
|
struct inode *inode;
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struct ubifs_info *c = dir->i_sb->s_fs_info;
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struct fscrypt_name nm;
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|
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/*
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* Create an inode('nlink = 1') for whiteout without updating journal,
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* let ubifs_jnl_rename() store it on flash to complete rename whiteout
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* atomically.
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*/
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|
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dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
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dentry, mode, dir->i_ino);
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|
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err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
|
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if (err)
|
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return ERR_PTR(err);
|
|
|
|
inode = ubifs_new_inode(c, dir, mode, false);
|
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if (IS_ERR(inode)) {
|
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err = PTR_ERR(inode);
|
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goto out_free;
|
|
}
|
|
|
|
init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
|
|
ubifs_assert(c, inode->i_op == &ubifs_file_inode_operations);
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|
|
|
err = ubifs_init_security(dir, inode, &dentry->d_name);
|
|
if (err)
|
|
goto out_inode;
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|
|
|
/* The dir size is updated by do_rename. */
|
|
insert_inode_hash(inode);
|
|
|
|
return inode;
|
|
|
|
out_inode:
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
out_free:
|
|
fscrypt_free_filename(&nm);
|
|
ubifs_err(c, "cannot create whiteout file, error %d", err);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
/**
|
|
* lock_2_inodes - a wrapper for locking two UBIFS inodes.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
*
|
|
* We do not implement any tricks to guarantee strict lock ordering, because
|
|
* VFS has already done it for us on the @i_mutex. So this is just a simple
|
|
* wrapper function.
|
|
*/
|
|
static void lock_2_inodes(struct inode *inode1, struct inode *inode2)
|
|
{
|
|
mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
|
|
mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
|
|
}
|
|
|
|
/**
|
|
* unlock_2_inodes - a wrapper for unlocking two UBIFS inodes.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
*/
|
|
static void unlock_2_inodes(struct inode *inode1, struct inode *inode2)
|
|
{
|
|
mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
|
|
mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
|
|
}
|
|
|
|
static int ubifs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct file *file, umode_t mode)
|
|
{
|
|
struct dentry *dentry = file->f_path.dentry;
|
|
struct inode *inode;
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.dirtied_ino = 1};
|
|
struct ubifs_budget_req ino_req = { .dirtied_ino = 1 };
|
|
struct ubifs_inode *ui;
|
|
int err, instantiated = 0;
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: new inode, new direntry, changing the
|
|
* parent directory inode.
|
|
* Allocate budget separately for new dirtied inode, the budget will
|
|
* be released via writeback.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
|
|
dentry, mode, dir->i_ino);
|
|
|
|
err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
fscrypt_free_filename(&nm);
|
|
return err;
|
|
}
|
|
|
|
err = ubifs_budget_space(c, &ino_req);
|
|
if (err) {
|
|
ubifs_release_budget(c, &req);
|
|
fscrypt_free_filename(&nm);
|
|
return err;
|
|
}
|
|
|
|
inode = ubifs_new_inode(c, dir, mode, false);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_budg;
|
|
}
|
|
ui = ubifs_inode(inode);
|
|
|
|
err = ubifs_init_security(dir, inode, &dentry->d_name);
|
|
if (err)
|
|
goto out_inode;
|
|
|
|
mutex_lock(&ui->ui_mutex);
|
|
insert_inode_hash(inode);
|
|
d_tmpfile(file, inode);
|
|
ubifs_assert(c, ui->dirty);
|
|
|
|
instantiated = 1;
|
|
mutex_unlock(&ui->ui_mutex);
|
|
|
|
lock_2_inodes(dir, inode);
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
unlock_2_inodes(dir, inode);
|
|
|
|
ubifs_release_budget(c, &req);
|
|
|
|
return finish_open_simple(file, 0);
|
|
|
|
out_cancel:
|
|
unlock_2_inodes(dir, inode);
|
|
out_inode:
|
|
make_bad_inode(inode);
|
|
if (!instantiated)
|
|
iput(inode);
|
|
out_budg:
|
|
ubifs_release_budget(c, &req);
|
|
if (!instantiated)
|
|
ubifs_release_budget(c, &ino_req);
|
|
fscrypt_free_filename(&nm);
|
|
ubifs_err(c, "cannot create temporary file, error %d", err);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* vfs_dent_type - get VFS directory entry type.
|
|
* @type: UBIFS directory entry type
|
|
*
|
|
* This function converts UBIFS directory entry type into VFS directory entry
|
|
* type.
|
|
*/
|
|
static unsigned int vfs_dent_type(uint8_t type)
|
|
{
|
|
switch (type) {
|
|
case UBIFS_ITYPE_REG:
|
|
return DT_REG;
|
|
case UBIFS_ITYPE_DIR:
|
|
return DT_DIR;
|
|
case UBIFS_ITYPE_LNK:
|
|
return DT_LNK;
|
|
case UBIFS_ITYPE_BLK:
|
|
return DT_BLK;
|
|
case UBIFS_ITYPE_CHR:
|
|
return DT_CHR;
|
|
case UBIFS_ITYPE_FIFO:
|
|
return DT_FIFO;
|
|
case UBIFS_ITYPE_SOCK:
|
|
return DT_SOCK;
|
|
default:
|
|
BUG();
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The classical Unix view for directory is that it is a linear array of
|
|
* (name, inode number) entries. Linux/VFS assumes this model as well.
|
|
* Particularly, 'readdir()' call wants us to return a directory entry offset
|
|
* which later may be used to continue 'readdir()'ing the directory or to
|
|
* 'seek()' to that specific direntry. Obviously UBIFS does not really fit this
|
|
* model because directory entries are identified by keys, which may collide.
|
|
*
|
|
* UBIFS uses directory entry hash value for directory offsets, so
|
|
* 'seekdir()'/'telldir()' may not always work because of possible key
|
|
* collisions. But UBIFS guarantees that consecutive 'readdir()' calls work
|
|
* properly by means of saving full directory entry name in the private field
|
|
* of the file description object.
|
|
*
|
|
* This means that UBIFS cannot support NFS which requires full
|
|
* 'seekdir()'/'telldir()' support.
|
|
*/
|
|
static int ubifs_readdir(struct file *file, struct dir_context *ctx)
|
|
{
|
|
int fstr_real_len = 0, err = 0;
|
|
struct fscrypt_name nm;
|
|
struct fscrypt_str fstr = {0};
|
|
union ubifs_key key;
|
|
struct ubifs_dent_node *dent;
|
|
struct inode *dir = file_inode(file);
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
bool encrypted = IS_ENCRYPTED(dir);
|
|
|
|
dbg_gen("dir ino %lu, f_pos %#llx", dir->i_ino, ctx->pos);
|
|
|
|
if (ctx->pos > UBIFS_S_KEY_HASH_MASK || ctx->pos == 2)
|
|
/*
|
|
* The directory was seek'ed to a senseless position or there
|
|
* are no more entries.
|
|
*/
|
|
return 0;
|
|
|
|
if (encrypted) {
|
|
err = fscrypt_prepare_readdir(dir);
|
|
if (err)
|
|
return err;
|
|
|
|
err = fscrypt_fname_alloc_buffer(UBIFS_MAX_NLEN, &fstr);
|
|
if (err)
|
|
return err;
|
|
|
|
fstr_real_len = fstr.len;
|
|
}
|
|
|
|
if (file->f_version == 0) {
|
|
/*
|
|
* The file was seek'ed, which means that @file->private_data
|
|
* is now invalid. This may also be just the first
|
|
* 'ubifs_readdir()' invocation, in which case
|
|
* @file->private_data is NULL, and the below code is
|
|
* basically a no-op.
|
|
*/
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
}
|
|
|
|
/*
|
|
* 'generic_file_llseek()' unconditionally sets @file->f_version to
|
|
* zero, and we use this for detecting whether the file was seek'ed.
|
|
*/
|
|
file->f_version = 1;
|
|
|
|
/* File positions 0 and 1 correspond to "." and ".." */
|
|
if (ctx->pos < 2) {
|
|
ubifs_assert(c, !file->private_data);
|
|
if (!dir_emit_dots(file, ctx)) {
|
|
if (encrypted)
|
|
fscrypt_fname_free_buffer(&fstr);
|
|
return 0;
|
|
}
|
|
|
|
/* Find the first entry in TNC and save it */
|
|
lowest_dent_key(c, &key, dir->i_ino);
|
|
fname_len(&nm) = 0;
|
|
dent = ubifs_tnc_next_ent(c, &key, &nm);
|
|
if (IS_ERR(dent)) {
|
|
err = PTR_ERR(dent);
|
|
goto out;
|
|
}
|
|
|
|
ctx->pos = key_hash_flash(c, &dent->key);
|
|
file->private_data = dent;
|
|
}
|
|
|
|
dent = file->private_data;
|
|
if (!dent) {
|
|
/*
|
|
* The directory was seek'ed to and is now readdir'ed.
|
|
* Find the entry corresponding to @ctx->pos or the closest one.
|
|
*/
|
|
dent_key_init_hash(c, &key, dir->i_ino, ctx->pos);
|
|
fname_len(&nm) = 0;
|
|
dent = ubifs_tnc_next_ent(c, &key, &nm);
|
|
if (IS_ERR(dent)) {
|
|
err = PTR_ERR(dent);
|
|
goto out;
|
|
}
|
|
ctx->pos = key_hash_flash(c, &dent->key);
|
|
file->private_data = dent;
|
|
}
|
|
|
|
while (1) {
|
|
dbg_gen("ino %llu, new f_pos %#x",
|
|
(unsigned long long)le64_to_cpu(dent->inum),
|
|
key_hash_flash(c, &dent->key));
|
|
ubifs_assert(c, le64_to_cpu(dent->ch.sqnum) >
|
|
ubifs_inode(dir)->creat_sqnum);
|
|
|
|
fname_len(&nm) = le16_to_cpu(dent->nlen);
|
|
fname_name(&nm) = dent->name;
|
|
|
|
if (encrypted) {
|
|
fstr.len = fstr_real_len;
|
|
|
|
err = fscrypt_fname_disk_to_usr(dir, key_hash_flash(c,
|
|
&dent->key),
|
|
le32_to_cpu(dent->cookie),
|
|
&nm.disk_name, &fstr);
|
|
if (err)
|
|
goto out;
|
|
} else {
|
|
fstr.len = fname_len(&nm);
|
|
fstr.name = fname_name(&nm);
|
|
}
|
|
|
|
if (!dir_emit(ctx, fstr.name, fstr.len,
|
|
le64_to_cpu(dent->inum),
|
|
vfs_dent_type(dent->type))) {
|
|
if (encrypted)
|
|
fscrypt_fname_free_buffer(&fstr);
|
|
return 0;
|
|
}
|
|
|
|
/* Switch to the next entry */
|
|
key_read(c, &dent->key, &key);
|
|
dent = ubifs_tnc_next_ent(c, &key, &nm);
|
|
if (IS_ERR(dent)) {
|
|
err = PTR_ERR(dent);
|
|
goto out;
|
|
}
|
|
|
|
kfree(file->private_data);
|
|
ctx->pos = key_hash_flash(c, &dent->key);
|
|
file->private_data = dent;
|
|
cond_resched();
|
|
}
|
|
|
|
out:
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
|
|
if (encrypted)
|
|
fscrypt_fname_free_buffer(&fstr);
|
|
|
|
if (err != -ENOENT)
|
|
ubifs_err(c, "cannot find next direntry, error %d", err);
|
|
else
|
|
/*
|
|
* -ENOENT is a non-fatal error in this context, the TNC uses
|
|
* it to indicate that the cursor moved past the current directory
|
|
* and readdir() has to stop.
|
|
*/
|
|
err = 0;
|
|
|
|
|
|
/* 2 is a special value indicating that there are no more direntries */
|
|
ctx->pos = 2;
|
|
return err;
|
|
}
|
|
|
|
/* Free saved readdir() state when the directory is closed */
|
|
static int ubifs_dir_release(struct inode *dir, struct file *file)
|
|
{
|
|
kfree(file->private_data);
|
|
file->private_data = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static int ubifs_link(struct dentry *old_dentry, struct inode *dir,
|
|
struct dentry *dentry)
|
|
{
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
struct inode *inode = d_inode(old_dentry);
|
|
struct ubifs_inode *ui = ubifs_inode(inode);
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
int err, sz_change = CALC_DENT_SIZE(dentry->d_name.len);
|
|
struct ubifs_budget_req req = { .new_dent = 1, .dirtied_ino = 2,
|
|
.dirtied_ino_d = ALIGN(ui->data_len, 8) };
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: new direntry, changing the target inode,
|
|
* changing the parent inode.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd' to ino %lu (nlink %d) in dir ino %lu",
|
|
dentry, inode->i_ino,
|
|
inode->i_nlink, dir->i_ino);
|
|
ubifs_assert(c, inode_is_locked(dir));
|
|
ubifs_assert(c, inode_is_locked(inode));
|
|
|
|
err = fscrypt_prepare_link(old_dentry, dir, dentry);
|
|
if (err)
|
|
return err;
|
|
|
|
err = fscrypt_setup_filename(dir, &dentry->d_name, 0, &nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = dbg_check_synced_i_size(c, inode);
|
|
if (err)
|
|
goto out_fname;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
goto out_fname;
|
|
|
|
lock_2_inodes(dir, inode);
|
|
|
|
/* Handle O_TMPFILE corner case, it is allowed to link a O_TMPFILE. */
|
|
if (inode->i_nlink == 0)
|
|
ubifs_delete_orphan(c, inode->i_ino);
|
|
|
|
inc_nlink(inode);
|
|
ihold(inode);
|
|
inode->i_ctime = current_time(inode);
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
unlock_2_inodes(dir, inode);
|
|
|
|
ubifs_release_budget(c, &req);
|
|
d_instantiate(dentry, inode);
|
|
fscrypt_free_filename(&nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
drop_nlink(inode);
|
|
if (inode->i_nlink == 0)
|
|
ubifs_add_orphan(c, inode->i_ino);
|
|
unlock_2_inodes(dir, inode);
|
|
ubifs_release_budget(c, &req);
|
|
iput(inode);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_unlink(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
int err, sz_change, budgeted = 1;
|
|
struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
|
|
unsigned int saved_nlink = inode->i_nlink;
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: deletion direntry, deletion inode (+1 for
|
|
* @dirtied_ino), changing the parent directory inode. If budgeting
|
|
* fails, go ahead anyway because we have extra space reserved for
|
|
* deletions.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd' from ino %lu (nlink %d) in dir ino %lu",
|
|
dentry, inode->i_ino,
|
|
inode->i_nlink, dir->i_ino);
|
|
|
|
err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_purge_xattrs(inode);
|
|
if (err)
|
|
return err;
|
|
|
|
sz_change = CALC_DENT_SIZE(fname_len(&nm));
|
|
|
|
ubifs_assert(c, inode_is_locked(dir));
|
|
ubifs_assert(c, inode_is_locked(inode));
|
|
err = dbg_check_synced_i_size(c, inode);
|
|
if (err)
|
|
goto out_fname;
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
if (err != -ENOSPC)
|
|
goto out_fname;
|
|
budgeted = 0;
|
|
}
|
|
|
|
lock_2_inodes(dir, inode);
|
|
inode->i_ctime = current_time(dir);
|
|
drop_nlink(inode);
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
unlock_2_inodes(dir, inode);
|
|
|
|
if (budgeted)
|
|
ubifs_release_budget(c, &req);
|
|
else {
|
|
/* We've deleted something - clean the "no space" flags */
|
|
c->bi.nospace = c->bi.nospace_rp = 0;
|
|
smp_wmb();
|
|
}
|
|
fscrypt_free_filename(&nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
set_nlink(inode, saved_nlink);
|
|
unlock_2_inodes(dir, inode);
|
|
if (budgeted)
|
|
ubifs_release_budget(c, &req);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubifs_check_dir_empty - check if a directory is empty or not.
|
|
* @dir: VFS inode object of the directory to check
|
|
*
|
|
* This function checks if directory @dir is empty. Returns zero if the
|
|
* directory is empty, %-ENOTEMPTY if it is not, and other negative error codes
|
|
* in case of errors.
|
|
*/
|
|
int ubifs_check_dir_empty(struct inode *dir)
|
|
{
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
struct fscrypt_name nm = { 0 };
|
|
struct ubifs_dent_node *dent;
|
|
union ubifs_key key;
|
|
int err;
|
|
|
|
lowest_dent_key(c, &key, dir->i_ino);
|
|
dent = ubifs_tnc_next_ent(c, &key, &nm);
|
|
if (IS_ERR(dent)) {
|
|
err = PTR_ERR(dent);
|
|
if (err == -ENOENT)
|
|
err = 0;
|
|
} else {
|
|
kfree(dent);
|
|
err = -ENOTEMPTY;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_rmdir(struct inode *dir, struct dentry *dentry)
|
|
{
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
struct inode *inode = d_inode(dentry);
|
|
int err, sz_change, budgeted = 1;
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
struct ubifs_budget_req req = { .mod_dent = 1, .dirtied_ino = 2 };
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: deletion direntry, deletion inode and
|
|
* changing the parent inode. If budgeting fails, go ahead anyway
|
|
* because we have extra space reserved for deletions.
|
|
*/
|
|
|
|
dbg_gen("directory '%pd', ino %lu in dir ino %lu", dentry,
|
|
inode->i_ino, dir->i_ino);
|
|
ubifs_assert(c, inode_is_locked(dir));
|
|
ubifs_assert(c, inode_is_locked(inode));
|
|
err = ubifs_check_dir_empty(d_inode(dentry));
|
|
if (err)
|
|
return err;
|
|
|
|
err = fscrypt_setup_filename(dir, &dentry->d_name, 1, &nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_purge_xattrs(inode);
|
|
if (err)
|
|
return err;
|
|
|
|
sz_change = CALC_DENT_SIZE(fname_len(&nm));
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
if (err != -ENOSPC)
|
|
goto out_fname;
|
|
budgeted = 0;
|
|
}
|
|
|
|
lock_2_inodes(dir, inode);
|
|
inode->i_ctime = current_time(dir);
|
|
clear_nlink(inode);
|
|
drop_nlink(dir);
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 1, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
unlock_2_inodes(dir, inode);
|
|
|
|
if (budgeted)
|
|
ubifs_release_budget(c, &req);
|
|
else {
|
|
/* We've deleted something - clean the "no space" flags */
|
|
c->bi.nospace = c->bi.nospace_rp = 0;
|
|
smp_wmb();
|
|
}
|
|
fscrypt_free_filename(&nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
inc_nlink(dir);
|
|
set_nlink(inode, 2);
|
|
unlock_2_inodes(dir, inode);
|
|
if (budgeted)
|
|
ubifs_release_budget(c, &req);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode)
|
|
{
|
|
struct inode *inode;
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
int err, sz_change;
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.dirtied_ino = 1};
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: new inode, new direntry and changing parent
|
|
* directory inode.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd', mode %#hx in dir ino %lu",
|
|
dentry, mode, dir->i_ino);
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_prepare_create(dir, dentry, &nm);
|
|
if (err)
|
|
goto out_budg;
|
|
|
|
sz_change = CALC_DENT_SIZE(fname_len(&nm));
|
|
|
|
inode = ubifs_new_inode(c, dir, S_IFDIR | mode, false);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_fname;
|
|
}
|
|
|
|
err = ubifs_init_security(dir, inode, &dentry->d_name);
|
|
if (err)
|
|
goto out_inode;
|
|
|
|
mutex_lock(&dir_ui->ui_mutex);
|
|
insert_inode_hash(inode);
|
|
inc_nlink(inode);
|
|
inc_nlink(dir);
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
|
|
if (err) {
|
|
ubifs_err(c, "cannot create directory, error %d", err);
|
|
goto out_cancel;
|
|
}
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
|
|
ubifs_release_budget(c, &req);
|
|
d_instantiate(dentry, inode);
|
|
fscrypt_free_filename(&nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
drop_nlink(dir);
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
out_inode:
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
out_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_mknod(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, umode_t mode, dev_t rdev)
|
|
{
|
|
struct inode *inode;
|
|
struct ubifs_inode *ui;
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
union ubifs_dev_desc *dev = NULL;
|
|
int sz_change;
|
|
int err, devlen = 0;
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.dirtied_ino = 1 };
|
|
struct fscrypt_name nm;
|
|
|
|
/*
|
|
* Budget request settings: new inode, new direntry and changing parent
|
|
* directory inode.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd' in dir ino %lu", dentry, dir->i_ino);
|
|
|
|
if (S_ISBLK(mode) || S_ISCHR(mode)) {
|
|
dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
|
|
if (!dev)
|
|
return -ENOMEM;
|
|
devlen = ubifs_encode_dev(dev, rdev);
|
|
}
|
|
|
|
req.new_ino_d = ALIGN(devlen, 8);
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
kfree(dev);
|
|
return err;
|
|
}
|
|
|
|
err = ubifs_prepare_create(dir, dentry, &nm);
|
|
if (err) {
|
|
kfree(dev);
|
|
goto out_budg;
|
|
}
|
|
|
|
sz_change = CALC_DENT_SIZE(fname_len(&nm));
|
|
|
|
inode = ubifs_new_inode(c, dir, mode, false);
|
|
if (IS_ERR(inode)) {
|
|
kfree(dev);
|
|
err = PTR_ERR(inode);
|
|
goto out_fname;
|
|
}
|
|
|
|
init_special_inode(inode, inode->i_mode, rdev);
|
|
inode->i_size = ubifs_inode(inode)->ui_size = devlen;
|
|
ui = ubifs_inode(inode);
|
|
ui->data = dev;
|
|
ui->data_len = devlen;
|
|
|
|
err = ubifs_init_security(dir, inode, &dentry->d_name);
|
|
if (err)
|
|
goto out_inode;
|
|
|
|
mutex_lock(&dir_ui->ui_mutex);
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
|
|
ubifs_release_budget(c, &req);
|
|
insert_inode_hash(inode);
|
|
d_instantiate(dentry, inode);
|
|
fscrypt_free_filename(&nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
out_inode:
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
out_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_symlink(struct mnt_idmap *idmap, struct inode *dir,
|
|
struct dentry *dentry, const char *symname)
|
|
{
|
|
struct inode *inode;
|
|
struct ubifs_inode *ui;
|
|
struct ubifs_inode *dir_ui = ubifs_inode(dir);
|
|
struct ubifs_info *c = dir->i_sb->s_fs_info;
|
|
int err, sz_change, len = strlen(symname);
|
|
struct fscrypt_str disk_link;
|
|
struct ubifs_budget_req req = { .new_ino = 1, .new_dent = 1,
|
|
.dirtied_ino = 1 };
|
|
struct fscrypt_name nm;
|
|
|
|
dbg_gen("dent '%pd', target '%s' in dir ino %lu", dentry,
|
|
symname, dir->i_ino);
|
|
|
|
err = fscrypt_prepare_symlink(dir, symname, len, UBIFS_MAX_INO_DATA,
|
|
&disk_link);
|
|
if (err)
|
|
return err;
|
|
|
|
/*
|
|
* Budget request settings: new inode, new direntry and changing parent
|
|
* directory inode.
|
|
*/
|
|
req.new_ino_d = ALIGN(disk_link.len - 1, 8);
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
return err;
|
|
|
|
err = ubifs_prepare_create(dir, dentry, &nm);
|
|
if (err)
|
|
goto out_budg;
|
|
|
|
sz_change = CALC_DENT_SIZE(fname_len(&nm));
|
|
|
|
inode = ubifs_new_inode(c, dir, S_IFLNK | S_IRWXUGO, false);
|
|
if (IS_ERR(inode)) {
|
|
err = PTR_ERR(inode);
|
|
goto out_fname;
|
|
}
|
|
|
|
ui = ubifs_inode(inode);
|
|
ui->data = kmalloc(disk_link.len, GFP_NOFS);
|
|
if (!ui->data) {
|
|
err = -ENOMEM;
|
|
goto out_inode;
|
|
}
|
|
|
|
if (IS_ENCRYPTED(inode)) {
|
|
disk_link.name = ui->data; /* encrypt directly into ui->data */
|
|
err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
|
|
if (err)
|
|
goto out_inode;
|
|
} else {
|
|
memcpy(ui->data, disk_link.name, disk_link.len);
|
|
inode->i_link = ui->data;
|
|
}
|
|
|
|
/*
|
|
* The terminating zero byte is not written to the flash media and it
|
|
* is put just to make later in-memory string processing simpler. Thus,
|
|
* data length is @disk_link.len - 1, not @disk_link.len.
|
|
*/
|
|
ui->data_len = disk_link.len - 1;
|
|
inode->i_size = ubifs_inode(inode)->ui_size = disk_link.len - 1;
|
|
|
|
err = ubifs_init_security(dir, inode, &dentry->d_name);
|
|
if (err)
|
|
goto out_inode;
|
|
|
|
mutex_lock(&dir_ui->ui_mutex);
|
|
dir->i_size += sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
dir->i_mtime = dir->i_ctime = inode->i_ctime;
|
|
err = ubifs_jnl_update(c, dir, &nm, inode, 0, 0);
|
|
if (err)
|
|
goto out_cancel;
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
|
|
insert_inode_hash(inode);
|
|
d_instantiate(dentry, inode);
|
|
err = 0;
|
|
goto out_fname;
|
|
|
|
out_cancel:
|
|
dir->i_size -= sz_change;
|
|
dir_ui->ui_size = dir->i_size;
|
|
mutex_unlock(&dir_ui->ui_mutex);
|
|
out_inode:
|
|
make_bad_inode(inode);
|
|
iput(inode);
|
|
out_fname:
|
|
fscrypt_free_filename(&nm);
|
|
out_budg:
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* lock_4_inodes - a wrapper for locking three UBIFS inodes.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
* @inode3: third inode
|
|
* @inode4: fourth inode
|
|
*
|
|
* This function is used for 'ubifs_rename()' and @inode1 may be the same as
|
|
* @inode2 whereas @inode3 and @inode4 may be %NULL.
|
|
*
|
|
* We do not implement any tricks to guarantee strict lock ordering, because
|
|
* VFS has already done it for us on the @i_mutex. So this is just a simple
|
|
* wrapper function.
|
|
*/
|
|
static void lock_4_inodes(struct inode *inode1, struct inode *inode2,
|
|
struct inode *inode3, struct inode *inode4)
|
|
{
|
|
mutex_lock_nested(&ubifs_inode(inode1)->ui_mutex, WB_MUTEX_1);
|
|
if (inode2 != inode1)
|
|
mutex_lock_nested(&ubifs_inode(inode2)->ui_mutex, WB_MUTEX_2);
|
|
if (inode3)
|
|
mutex_lock_nested(&ubifs_inode(inode3)->ui_mutex, WB_MUTEX_3);
|
|
if (inode4)
|
|
mutex_lock_nested(&ubifs_inode(inode4)->ui_mutex, WB_MUTEX_4);
|
|
}
|
|
|
|
/**
|
|
* unlock_4_inodes - a wrapper for unlocking three UBIFS inodes for rename.
|
|
* @inode1: first inode
|
|
* @inode2: second inode
|
|
* @inode3: third inode
|
|
* @inode4: fourth inode
|
|
*/
|
|
static void unlock_4_inodes(struct inode *inode1, struct inode *inode2,
|
|
struct inode *inode3, struct inode *inode4)
|
|
{
|
|
if (inode4)
|
|
mutex_unlock(&ubifs_inode(inode4)->ui_mutex);
|
|
if (inode3)
|
|
mutex_unlock(&ubifs_inode(inode3)->ui_mutex);
|
|
if (inode1 != inode2)
|
|
mutex_unlock(&ubifs_inode(inode2)->ui_mutex);
|
|
mutex_unlock(&ubifs_inode(inode1)->ui_mutex);
|
|
}
|
|
|
|
static int do_rename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
struct ubifs_info *c = old_dir->i_sb->s_fs_info;
|
|
struct inode *old_inode = d_inode(old_dentry);
|
|
struct inode *new_inode = d_inode(new_dentry);
|
|
struct inode *whiteout = NULL;
|
|
struct ubifs_inode *old_inode_ui = ubifs_inode(old_inode);
|
|
struct ubifs_inode *whiteout_ui = NULL;
|
|
int err, release, sync = 0, move = (new_dir != old_dir);
|
|
int is_dir = S_ISDIR(old_inode->i_mode);
|
|
int unlink = !!new_inode, new_sz, old_sz;
|
|
struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
|
|
.dirtied_ino = 3 };
|
|
struct ubifs_budget_req ino_req = { .dirtied_ino = 1,
|
|
.dirtied_ino_d = ALIGN(old_inode_ui->data_len, 8) };
|
|
struct ubifs_budget_req wht_req;
|
|
struct timespec64 time;
|
|
unsigned int saved_nlink;
|
|
struct fscrypt_name old_nm, new_nm;
|
|
|
|
/*
|
|
* Budget request settings:
|
|
* req: deletion direntry, new direntry, removing the old inode,
|
|
* and changing old and new parent directory inodes.
|
|
*
|
|
* wht_req: new whiteout inode for RENAME_WHITEOUT.
|
|
*
|
|
* ino_req: marks the target inode as dirty and does not write it.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd' ino %lu in dir ino %lu to dent '%pd' in dir ino %lu flags 0x%x",
|
|
old_dentry, old_inode->i_ino, old_dir->i_ino,
|
|
new_dentry, new_dir->i_ino, flags);
|
|
|
|
if (unlink) {
|
|
ubifs_assert(c, inode_is_locked(new_inode));
|
|
|
|
/* Budget for old inode's data when its nlink > 1. */
|
|
req.dirtied_ino_d = ALIGN(ubifs_inode(new_inode)->data_len, 8);
|
|
err = ubifs_purge_xattrs(new_inode);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (unlink && is_dir) {
|
|
err = ubifs_check_dir_empty(new_inode);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &old_nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &new_nm);
|
|
if (err) {
|
|
fscrypt_free_filename(&old_nm);
|
|
return err;
|
|
}
|
|
|
|
new_sz = CALC_DENT_SIZE(fname_len(&new_nm));
|
|
old_sz = CALC_DENT_SIZE(fname_len(&old_nm));
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err) {
|
|
fscrypt_free_filename(&old_nm);
|
|
fscrypt_free_filename(&new_nm);
|
|
return err;
|
|
}
|
|
err = ubifs_budget_space(c, &ino_req);
|
|
if (err) {
|
|
fscrypt_free_filename(&old_nm);
|
|
fscrypt_free_filename(&new_nm);
|
|
ubifs_release_budget(c, &req);
|
|
return err;
|
|
}
|
|
|
|
if (flags & RENAME_WHITEOUT) {
|
|
union ubifs_dev_desc *dev = NULL;
|
|
|
|
dev = kmalloc(sizeof(union ubifs_dev_desc), GFP_NOFS);
|
|
if (!dev) {
|
|
err = -ENOMEM;
|
|
goto out_release;
|
|
}
|
|
|
|
/*
|
|
* The whiteout inode without dentry is pinned in memory,
|
|
* umount won't happen during rename process because we
|
|
* got parent dentry.
|
|
*/
|
|
whiteout = create_whiteout(old_dir, old_dentry);
|
|
if (IS_ERR(whiteout)) {
|
|
err = PTR_ERR(whiteout);
|
|
kfree(dev);
|
|
goto out_release;
|
|
}
|
|
|
|
whiteout_ui = ubifs_inode(whiteout);
|
|
whiteout_ui->data = dev;
|
|
whiteout_ui->data_len = ubifs_encode_dev(dev, MKDEV(0, 0));
|
|
ubifs_assert(c, !whiteout_ui->dirty);
|
|
|
|
memset(&wht_req, 0, sizeof(struct ubifs_budget_req));
|
|
wht_req.new_ino = 1;
|
|
wht_req.new_ino_d = ALIGN(whiteout_ui->data_len, 8);
|
|
/*
|
|
* To avoid deadlock between space budget (holds ui_mutex and
|
|
* waits wb work) and writeback work(waits ui_mutex), do space
|
|
* budget before ubifs inodes locked.
|
|
*/
|
|
err = ubifs_budget_space(c, &wht_req);
|
|
if (err) {
|
|
/*
|
|
* Whiteout inode can not be written on flash by
|
|
* ubifs_jnl_write_inode(), because it's neither
|
|
* dirty nor zero-nlink.
|
|
*/
|
|
iput(whiteout);
|
|
goto out_release;
|
|
}
|
|
|
|
/* Add the old_dentry size to the old_dir size. */
|
|
old_sz -= CALC_DENT_SIZE(fname_len(&old_nm));
|
|
}
|
|
|
|
lock_4_inodes(old_dir, new_dir, new_inode, whiteout);
|
|
|
|
/*
|
|
* Like most other Unix systems, set the @i_ctime for inodes on a
|
|
* rename.
|
|
*/
|
|
time = current_time(old_dir);
|
|
old_inode->i_ctime = time;
|
|
|
|
/* We must adjust parent link count when renaming directories */
|
|
if (is_dir) {
|
|
if (move) {
|
|
/*
|
|
* @old_dir loses a link because we are moving
|
|
* @old_inode to a different directory.
|
|
*/
|
|
drop_nlink(old_dir);
|
|
/*
|
|
* @new_dir only gains a link if we are not also
|
|
* overwriting an existing directory.
|
|
*/
|
|
if (!unlink)
|
|
inc_nlink(new_dir);
|
|
} else {
|
|
/*
|
|
* @old_inode is not moving to a different directory,
|
|
* but @old_dir still loses a link if we are
|
|
* overwriting an existing directory.
|
|
*/
|
|
if (unlink)
|
|
drop_nlink(old_dir);
|
|
}
|
|
}
|
|
|
|
old_dir->i_size -= old_sz;
|
|
ubifs_inode(old_dir)->ui_size = old_dir->i_size;
|
|
old_dir->i_mtime = old_dir->i_ctime = time;
|
|
new_dir->i_mtime = new_dir->i_ctime = time;
|
|
|
|
/*
|
|
* And finally, if we unlinked a direntry which happened to have the
|
|
* same name as the moved direntry, we have to decrement @i_nlink of
|
|
* the unlinked inode and change its ctime.
|
|
*/
|
|
if (unlink) {
|
|
/*
|
|
* Directories cannot have hard-links, so if this is a
|
|
* directory, just clear @i_nlink.
|
|
*/
|
|
saved_nlink = new_inode->i_nlink;
|
|
if (is_dir)
|
|
clear_nlink(new_inode);
|
|
else
|
|
drop_nlink(new_inode);
|
|
new_inode->i_ctime = time;
|
|
} else {
|
|
new_dir->i_size += new_sz;
|
|
ubifs_inode(new_dir)->ui_size = new_dir->i_size;
|
|
}
|
|
|
|
/*
|
|
* Do not ask 'ubifs_jnl_rename()' to flush write-buffer if @old_inode
|
|
* is dirty, because this will be done later on at the end of
|
|
* 'ubifs_rename()'.
|
|
*/
|
|
if (IS_SYNC(old_inode)) {
|
|
sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
|
|
if (unlink && IS_SYNC(new_inode))
|
|
sync = 1;
|
|
/*
|
|
* S_SYNC flag of whiteout inherits from the old_dir, and we
|
|
* have already checked the old dir inode. So there is no need
|
|
* to check whiteout.
|
|
*/
|
|
}
|
|
|
|
err = ubifs_jnl_rename(c, old_dir, old_inode, &old_nm, new_dir,
|
|
new_inode, &new_nm, whiteout, sync);
|
|
if (err)
|
|
goto out_cancel;
|
|
|
|
unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
|
|
ubifs_release_budget(c, &req);
|
|
|
|
if (whiteout) {
|
|
ubifs_release_budget(c, &wht_req);
|
|
iput(whiteout);
|
|
}
|
|
|
|
mutex_lock(&old_inode_ui->ui_mutex);
|
|
release = old_inode_ui->dirty;
|
|
mark_inode_dirty_sync(old_inode);
|
|
mutex_unlock(&old_inode_ui->ui_mutex);
|
|
|
|
if (release)
|
|
ubifs_release_budget(c, &ino_req);
|
|
if (IS_SYNC(old_inode))
|
|
/*
|
|
* Rename finished here. Although old inode cannot be updated
|
|
* on flash, old ctime is not a big problem, don't return err
|
|
* code to userspace.
|
|
*/
|
|
old_inode->i_sb->s_op->write_inode(old_inode, NULL);
|
|
|
|
fscrypt_free_filename(&old_nm);
|
|
fscrypt_free_filename(&new_nm);
|
|
return 0;
|
|
|
|
out_cancel:
|
|
if (unlink) {
|
|
set_nlink(new_inode, saved_nlink);
|
|
} else {
|
|
new_dir->i_size -= new_sz;
|
|
ubifs_inode(new_dir)->ui_size = new_dir->i_size;
|
|
}
|
|
old_dir->i_size += old_sz;
|
|
ubifs_inode(old_dir)->ui_size = old_dir->i_size;
|
|
if (is_dir) {
|
|
if (move) {
|
|
inc_nlink(old_dir);
|
|
if (!unlink)
|
|
drop_nlink(new_dir);
|
|
} else {
|
|
if (unlink)
|
|
inc_nlink(old_dir);
|
|
}
|
|
}
|
|
unlock_4_inodes(old_dir, new_dir, new_inode, whiteout);
|
|
if (whiteout) {
|
|
ubifs_release_budget(c, &wht_req);
|
|
iput(whiteout);
|
|
}
|
|
out_release:
|
|
ubifs_release_budget(c, &ino_req);
|
|
ubifs_release_budget(c, &req);
|
|
fscrypt_free_filename(&old_nm);
|
|
fscrypt_free_filename(&new_nm);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_xrename(struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry)
|
|
{
|
|
struct ubifs_info *c = old_dir->i_sb->s_fs_info;
|
|
struct ubifs_budget_req req = { .new_dent = 1, .mod_dent = 1,
|
|
.dirtied_ino = 2 };
|
|
int sync = IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir);
|
|
struct inode *fst_inode = d_inode(old_dentry);
|
|
struct inode *snd_inode = d_inode(new_dentry);
|
|
struct timespec64 time;
|
|
int err;
|
|
struct fscrypt_name fst_nm, snd_nm;
|
|
|
|
ubifs_assert(c, fst_inode && snd_inode);
|
|
|
|
/*
|
|
* Budget request settings: changing two direntries, changing the two
|
|
* parent directory inodes.
|
|
*/
|
|
|
|
dbg_gen("dent '%pd' ino %lu in dir ino %lu exchange dent '%pd' ino %lu in dir ino %lu",
|
|
old_dentry, fst_inode->i_ino, old_dir->i_ino,
|
|
new_dentry, snd_inode->i_ino, new_dir->i_ino);
|
|
|
|
err = fscrypt_setup_filename(old_dir, &old_dentry->d_name, 0, &fst_nm);
|
|
if (err)
|
|
return err;
|
|
|
|
err = fscrypt_setup_filename(new_dir, &new_dentry->d_name, 0, &snd_nm);
|
|
if (err) {
|
|
fscrypt_free_filename(&fst_nm);
|
|
return err;
|
|
}
|
|
|
|
err = ubifs_budget_space(c, &req);
|
|
if (err)
|
|
goto out;
|
|
|
|
lock_4_inodes(old_dir, new_dir, NULL, NULL);
|
|
|
|
time = current_time(old_dir);
|
|
fst_inode->i_ctime = time;
|
|
snd_inode->i_ctime = time;
|
|
old_dir->i_mtime = old_dir->i_ctime = time;
|
|
new_dir->i_mtime = new_dir->i_ctime = time;
|
|
|
|
if (old_dir != new_dir) {
|
|
if (S_ISDIR(fst_inode->i_mode) && !S_ISDIR(snd_inode->i_mode)) {
|
|
inc_nlink(new_dir);
|
|
drop_nlink(old_dir);
|
|
}
|
|
else if (!S_ISDIR(fst_inode->i_mode) && S_ISDIR(snd_inode->i_mode)) {
|
|
drop_nlink(new_dir);
|
|
inc_nlink(old_dir);
|
|
}
|
|
}
|
|
|
|
err = ubifs_jnl_xrename(c, old_dir, fst_inode, &fst_nm, new_dir,
|
|
snd_inode, &snd_nm, sync);
|
|
|
|
unlock_4_inodes(old_dir, new_dir, NULL, NULL);
|
|
ubifs_release_budget(c, &req);
|
|
|
|
out:
|
|
fscrypt_free_filename(&fst_nm);
|
|
fscrypt_free_filename(&snd_nm);
|
|
return err;
|
|
}
|
|
|
|
static int ubifs_rename(struct mnt_idmap *idmap,
|
|
struct inode *old_dir, struct dentry *old_dentry,
|
|
struct inode *new_dir, struct dentry *new_dentry,
|
|
unsigned int flags)
|
|
{
|
|
int err;
|
|
struct ubifs_info *c = old_dir->i_sb->s_fs_info;
|
|
|
|
if (flags & ~(RENAME_NOREPLACE | RENAME_WHITEOUT | RENAME_EXCHANGE))
|
|
return -EINVAL;
|
|
|
|
ubifs_assert(c, inode_is_locked(old_dir));
|
|
ubifs_assert(c, inode_is_locked(new_dir));
|
|
|
|
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
|
|
flags);
|
|
if (err)
|
|
return err;
|
|
|
|
if (flags & RENAME_EXCHANGE)
|
|
return ubifs_xrename(old_dir, old_dentry, new_dir, new_dentry);
|
|
|
|
return do_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
|
|
}
|
|
|
|
int ubifs_getattr(struct mnt_idmap *idmap, const struct path *path,
|
|
struct kstat *stat, u32 request_mask, unsigned int flags)
|
|
{
|
|
loff_t size;
|
|
struct inode *inode = d_inode(path->dentry);
|
|
struct ubifs_inode *ui = ubifs_inode(inode);
|
|
|
|
mutex_lock(&ui->ui_mutex);
|
|
|
|
if (ui->flags & UBIFS_APPEND_FL)
|
|
stat->attributes |= STATX_ATTR_APPEND;
|
|
if (ui->flags & UBIFS_COMPR_FL)
|
|
stat->attributes |= STATX_ATTR_COMPRESSED;
|
|
if (ui->flags & UBIFS_CRYPT_FL)
|
|
stat->attributes |= STATX_ATTR_ENCRYPTED;
|
|
if (ui->flags & UBIFS_IMMUTABLE_FL)
|
|
stat->attributes |= STATX_ATTR_IMMUTABLE;
|
|
|
|
stat->attributes_mask |= (STATX_ATTR_APPEND |
|
|
STATX_ATTR_COMPRESSED |
|
|
STATX_ATTR_ENCRYPTED |
|
|
STATX_ATTR_IMMUTABLE);
|
|
|
|
generic_fillattr(&nop_mnt_idmap, inode, stat);
|
|
stat->blksize = UBIFS_BLOCK_SIZE;
|
|
stat->size = ui->ui_size;
|
|
|
|
/*
|
|
* Unfortunately, the 'stat()' system call was designed for block
|
|
* device based file systems, and it is not appropriate for UBIFS,
|
|
* because UBIFS does not have notion of "block". For example, it is
|
|
* difficult to tell how many block a directory takes - it actually
|
|
* takes less than 300 bytes, but we have to round it to block size,
|
|
* which introduces large mistake. This makes utilities like 'du' to
|
|
* report completely senseless numbers. This is the reason why UBIFS
|
|
* goes the same way as JFFS2 - it reports zero blocks for everything
|
|
* but regular files, which makes more sense than reporting completely
|
|
* wrong sizes.
|
|
*/
|
|
if (S_ISREG(inode->i_mode)) {
|
|
size = ui->xattr_size;
|
|
size += stat->size;
|
|
size = ALIGN(size, UBIFS_BLOCK_SIZE);
|
|
/*
|
|
* Note, user-space expects 512-byte blocks count irrespectively
|
|
* of what was reported in @stat->size.
|
|
*/
|
|
stat->blocks = size >> 9;
|
|
} else
|
|
stat->blocks = 0;
|
|
mutex_unlock(&ui->ui_mutex);
|
|
return 0;
|
|
}
|
|
|
|
const struct inode_operations ubifs_dir_inode_operations = {
|
|
.lookup = ubifs_lookup,
|
|
.create = ubifs_create,
|
|
.link = ubifs_link,
|
|
.symlink = ubifs_symlink,
|
|
.unlink = ubifs_unlink,
|
|
.mkdir = ubifs_mkdir,
|
|
.rmdir = ubifs_rmdir,
|
|
.mknod = ubifs_mknod,
|
|
.rename = ubifs_rename,
|
|
.setattr = ubifs_setattr,
|
|
.getattr = ubifs_getattr,
|
|
.listxattr = ubifs_listxattr,
|
|
.update_time = ubifs_update_time,
|
|
.tmpfile = ubifs_tmpfile,
|
|
.fileattr_get = ubifs_fileattr_get,
|
|
.fileattr_set = ubifs_fileattr_set,
|
|
};
|
|
|
|
const struct file_operations ubifs_dir_operations = {
|
|
.llseek = generic_file_llseek,
|
|
.release = ubifs_dir_release,
|
|
.read = generic_read_dir,
|
|
.iterate_shared = ubifs_readdir,
|
|
.fsync = ubifs_fsync,
|
|
.unlocked_ioctl = ubifs_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = ubifs_compat_ioctl,
|
|
#endif
|
|
};
|